Hydrilla and water hyacinth, two of the worst aquatic weeds, have taken over the surface of Tapi River in India just above the pumping stations. This phenomenon of summer, which creates problems in the pumping of water from the pumping stations to Surat city, has occurred this time of the year for the first time. The reason for the growth of vegetation is reduced water level in Tapi River.
The vegetation has got a chance to grow because of sewage in the upstream of the river. When water level is low, the sewage acts as nutrition for weeds and help them to grow faster.
The vegetation will need to be removed or else it would interrupt the pumping of water into intake wells and from the pumping stations.